Question #248869 on Yade changed:
https://answers.launchpad.net/yade/+question/248869
Status: Answered => Open
Anton Gladky is still having a problem:
2014-05-19 11:56 GMT+02:00 Bruno Chareyre
<[email protected]>:
> Bruno Chareyre proposed the following answer:
> Is there something special hapening to state-ori before step 154675
> (manipulation in the script, some specialized clump functions, etc?),
No, it is just a free fall of clump and it reaches the floor at the step 154675.
Some more info for previous steps:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
b->id: 209; Iter:154673
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
A: 0.934319 -0.193747 0.299181
0.188102 0.980983 0.0478483
-0.302762 0.0115711 0.952996
....
....
state->ori: 0.9834 0.00922239 -0.153026 -0.0970739
state->angVel: 0 0 0
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
b->id: 209; Iter:154674
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
A: 0.934319 -0.193747 0.299181
0.188102 0.980983 0.0478483
-0.302762 0.0115711 0.952996
M: 0.934319 -0.193747 0.299181
0.188102 0.980983 0.0478483
-0.302762 0.0115711 0.952996
....
....
state->ori: 0.9834 0.00922239 -0.153026 -0.0970739
state->angVel: 0 0 0
> because orientation quaternion seems very badly normalized.
>
> A rotation matrix should be skew-symmetric, here you have:
> A: 0.934319 -0.193747 0.299181
> 0.188102 0.980983 0.0478483
> -0.302762 0.0115711 0.952996
>
> I'm not sure it is related to your problem, but it is very strange.
> Orientation is normalized at the end of leapfrogAsphericalRotate, so it
> should be ok at the next step. But again at step 154676 it does not give a
> good rotation matrix.
> Something happening at each step, before Newton?!
Hmm, no there is nothing especial. I did not change the code either, as I never
worked with clumps. Interesting is that this clump is not the first one in the
simulation.
Anyway thanks a lot for info! That is something already.
Anton
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